浙江省森林生态系统五大碳库碳汇功能及结构特征

Carbon Sink Function and Structural Characteristics of Five MajorCarbon Pools in Zhejiang Forest Ecosystem

为准确评估浙江省森林生态系统5个碳库碳储量,基于浙江省森林资源年度监测体系,建立了各碳库基础数据外业调查、样品采集系统抽样调查体系,并在全省共调查地上、地下和枯死木碳库样地4252个,调查枯落物、土壤碳库样地906个.以样地为基本单元,运用系统抽样估计方法,测算了各碳库碳储量,分析了各碳库碳储量结特征,提供了评估结果的抽样精度和置信区间.结果显示,浙江森林生态系统碳储量931.74 Tg C.其中:土壤有机质碳库占70.43%,是森林生态系统最大碳库,地上生物量碳库占20.59%,地下生物量碳库占7.15%,枯死木碳库占0.67%,枯落物碳库占1.16%.在p=0.95的可靠性保证下,地上、地下碳库抽样精度分别为96.50%和96.71%,枯落物、土壤碳库分别为93.75%和94.10%,枯死木碳库抽样精度89.36%.

In order to accurately assess the carbon storage of five main carbon pools in the forest ecosystem of Zhejiang Province,a sampling survey technical system for collecting basic data of each carbon pool through field survey and sample collection was established based on the annual monitoring system of the forest resources in Zhejiang Province.In total,there were 4252 plots for collecting above-ground,underground and dead woods carbon pools and 906 plots for collecting litter and soil carbon pools.Basing on the sample plots and systematic sampling estimation method,the carbon storage of each carbon pool was estimated,the carbon storage characteristics were analyzed,and the sampling accuracy and confidence interval of the evaluation results were presented.The results showed that the carbon storage of the forest ecosystem in Zhejiang Province was 931.74 Tg C.Soil organic carbon pool accounts for 70.43%of the total carbon storage,which is the largest carbon pool in the forest ecosystem.Above-ground biomass carbon pool accounts for 20.59%,underground biomass carbon pool accounts for 7.15%,dead wood carbon pool accounts for 0.67%,and litter carbon pool accounts for 1.16%.At the 95%confidence level,the sampling precision of above-ground and underground carbon storage was 96.50%and 96.71%,that of litter and soil was 93.75%and 94.10%respectively,and that of dead wood was 89.36%.